Home / 100,440.40-138,607.32-55,119.12

Finding the Fourth Proportional to 100,440.40, 138,607.32 and 55,119.12

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Solution

The fourth proportional to 100,440.40, 138,607.32 and 55,119.12 is: 76,064.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,440.40 : 138,607.32 = 55,119.12 : x
  2. Step 2: Convert to fraction form
    100,440.40/138,607.32 = 55,119.12/x
  3. Step 3: Cross multiply
    100,440.40x = 138,607.32 × 55,119.12
  4. Step 4: Simplify right side
    100,440.40x = 7,639,913,503.96
  5. Step 5: Solve for x
    x = 7,639,913,503.96/100,440.40
  6. Step 6: Final answer
    x = 76,064.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.